Groucho Marx as Sam Grunion

Harpo Marx as Harpo

Chico Marx as Faustino the Great

Ilona Massey as Madame Egelichi

Vera-Ellen as Maggie Phillips

Marion Hutton as Bunny Dolan

Raymond Burr as Alphonse Zoto

Melville Cooper as Lefty Throckmorton

Paul Valentine as Mike Johnson

Bruce Gordon as Hannibal Zoto

Marilyn Monroe as Grunion's Client

Leon Belasco as Mr. Lyons

Eric Blore as Mackinaw

Otto Waldis as Ivan (uncredited)